No problem, we've got 4207 and 3989 to multiply
4207 × 3989 = 3989 × (4207)
+ 3989 × 7 producing 27923
+ 3989 × 00 yielding 0
+ 3989 × 200 that results in 797800
+ 3989 × 4000 producing 15956000

= 16781723
